Motor-control system.



P. E. CASE.

MDTOR CONTROL SYSTEM.

APPLICATION FILED DB0. 4, 1911.

1).()37435 Patented Sept. 3, 1912.

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Fran/ Case,-

To liz/L' fw' om msg/l concern:

,telieneetstly, eoinitjy' t Solieneetecly, State of New York, lieveinventefl Certain new anni useful improvements in Motor-Control Syst ns,of which the following; is e speelu This invention relates to thecontrol of electric motors has particular reference to 'what is known esthe series parallel systems of :noter control. More speeiieally myinvention relates to a series 'perellel system ef motor control nserl inconnection with s storage battery as source of power.

One ezt the objects of my invention is to provide snoh e system inconnection mth' a storage battery in which the change een be merle fromthe series to the pai-fellel connection in 2L simple manner and with emininnnn number of controller contacts.

ln carrying out my invention make e permanent connection from one sitleof the storage battery to one of the motor armetnres and continue thispermanent connection through the lielcl oi this rst inciter and throughthe starting res.l tence and the field ot the seeonol moto? to the.armature of the sconti motor successively, l then provide s Controllerso srrengeii tint upon starting,

the armature of the second moti is connected with the opposite side oithe storage' battery, tert-her movement of the controllei' the startingresiste-nee is ont out and the @minet-,tion with the second motorarmetu'i'e shifted to en intermediate Apoint of the iesis'tence. Forifiill parallel neming', connection is also inode between the outsidebrushes ot the tivo motorsa With this arrangement the eonneeticns of thelirst motor, the resistance, end the lielfl oi the second .motor are allpermanent, the only connection. it is necessary to sneek heilig the oneconnection of the seconclL mot-or armature.

in the accompanying drawing illustrating my invention, Figure .l is adiagrammatic represent-ation of in v motor control equipment shownassociated with the controller for @lensing the connections, and Figs. Qto 'v sive show the connections which are insole in the variouspositions oi? the controllen rst to Fi/2l 1, A represents the F theseries eld of the first motor, Weile i represents the armature and '11"the series of the eeeonfl represents e Storage battery enti R estorting; resistsnoe. C represents a controller having seven. seguierpositions sind two transient positions for making" the various connections. lteeriing to Fig. 1, .it 'will he Seen that when the Controlleris moved to the firstposition the connect-ions will he es shown in Fig.2, that is, rthere Will he e permanent eonneetion from the negative sideoi2 the battery through conductor to the errnoture A, iielcl F,resistance R, conductor 11, iielcl F', armature A, conductor 12 tooontactl. From this point the circuit. is com plete thronff'ii thesegments ill and le' to the 'positive side of the battery. *When thecontroller is moved further the resistance R is gradually cut out untilthe controller reaches the fourth posit-ion when the connections will heas shown in Fig. 3, in which the resistance is short Gironi-ted. Betweenthe fourth and fifth positions are two transition positions representedby the sonne@ tions shown in Figs. l and 5. The first transition occurswhen the eontect 16 en gages segment 17 so that the connection is merlefrom conductor 10 to armature A, ielcl E", inni half of the resistanceto seg nient 1S, thence to segment i? an Contact 16 back to the positiveside of the batteryJ The 4next transition step occurs when the Contact13 leaves the segment 11i thereby breaking' the connection oli'Armel-nre A', es shown in Fig'. lVhen the controller is moved to thefifth regular position, the contests 13 and 1f) eng/)ege with thecontacts 2O and Q1, respectively, so that the connections will he esshown in 6. ily referring to Fig. 1 it will he seen that theseconnections are from the negative sicle o'l` the bettery to Contact 21,thence through twopziths, one of which is through conclnetor 10,armature A, iielel l?, heli of resistance-R to segment 18, thence tosegment 17, and contact 16 back to the positive side of the battery,While the other path is from the negative side of the battery tosegments Q1, 20 and Contact 13, conductor 12, armature It", field F',heli of resistance R, to segment 18, thence to segment 17 and baalt tothe positive side of the battery. In this position thle motors are infull parallel with half ofthe resistance in series with each other. Whenthe controller is now moved to the sixth L i illu, 1o 1i.

not l. mit ff rions nic theinseliee out denk ,l ,mg from tions the scopeof Whies f annexed elaims.

lWhat claim new deslice, tosecne by Letters Patent of the United States,is,-

l. ln a seriesl parallel system of ,motor oentol, in combination, astorage babbel??9 a bei? of motos havingthei fields connected ANJ CIL

between the aimatnies a resistance connecte'd between the fields, apei'manent connection fiom one side of the batteryT to one of saidarmatures, and means foroonneoting the opposite side of the battefyeithez to the other armature or the resistance.

2. ln a series parallel System of motor control, in combination, astoiage battety, a-

pair ol: motors, a starting resistance for said motors?, a permanentconnection from .one side of the battery to one of the motor al1 maturesand thence in series through the field of said motor, the startingresistance,

the field: and 'armati-ire of the second motor' successivelgn and ineensfor connecting the opposite' side of the battery either tothe armatureoi the second motor oi* to an intermediate point of the resistance.

En a sei'ies parallel system ofmotoiz eontroh in eomloiifisdion9 a.storage hattezeya a pair of motos, a permanent eonnection from one sideof the battei'y to one ofthe 1annatnies and thence in series :Uh the'field said moto;s and the field almatme of the second motor snoeessiteeide of the batteiy either to the ai'ina time of the second motor oi toa point be- 'the ields ofthe motors.

a series paiellel system of motoi Vl5 in combination, a storage battery,a of motoisa a pen'xanent connection velgT means flo? connecting theopp@l om one side of the battez1T`7 to one of the connection from onesideof thefbattery to n one of the motorl armatures and thence in seriesthrough the field of said motor, the resistance, and the field andarmatureof the second motor successively, and a controller arranged toconnectthe opposite side of the battery with the armature of the secondmotor and gradually out out the .resistance for starting, and thenconnect the last mentioned side of the batte'y to an intermediate pointon the resistance and establish a circuit connection between the motorazmatnres for parallel running.,

ln Witnesswhereof, l have hereunto set my hand this 2nd day oflecemben.` 1911. i'

FRANK E. CASE. Witnesses BENJAMIN B. HULL, HELEN @wenn he obtained ierfive "eyedessing the Commissioner of Patents,

Weehiagten, El. Gf

